Answer:
The work done by the catcher is 120 J.
Explanation:
Given;
velocity of the fastball, v = 40 m/s
mass of the fastball, m = 150 g = 0.15 kg
Based on work-energy theorem, the work done by the catcher is equal to the kinetic energy of the fastball.
The kinetic energy of the fastball is given as;
K.E = ¹/₂mv²
K.E = ¹/₂ x 0.15 x 40²
K.E = 120 J
Therefore, the work done by the catcher is 120 J.
The correct answer is D. the star is getting farther away.
When the light has red-shifted, it shows that everything is moving away from a certain point. This is known as the Doppler effect and proves the Big Bang (which would be the center point that everything is moving away from). Just as a 'for your information', blue shift is when the star is moving towards us.
Hope I helped :)
Our Sun is one of many stars in the Milky Way galaxy. Earth is closer to the Sun than any other star. This is evident because " we rely on the Sun's radiant energy on Earth".
<u>Option: B</u>
<u>Explanation:</u>
The Sun produces much radiant energy which is distributed as light to the Earth. Plants supports only process called photosynthesis for their food production, transform the electromagnetic energy in sunlight into chemical energy for their food. Radiant electromagnetic waves can be either visible or invisible.
Maximum solar radiation is absorbed by the atmosphere, but much of what hits the surface of the earth is emitted back into the atmosphere for heat energy to result. Dark colored items like asphalt consume radiant energy more easily than objects colored with light.
